<!doctype html>
<html lang="en">
	<head>
		<title>three.js webgl - interactive - voxel painter</title>
		<meta charset="utf-8">
		<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
		<style>
			body {
				font-family: Monospace;
				background-color: #f0f0f0;
				margin: 0px;
				overflow: hidden;
			}

			#oldie { background-color: #ddd !important }
		</style>
	</head>
	<body>

		<script src="../build/Three.js"></script>

		<script src="js/Detector.js"></script>
		<script src="js/Stats.js"></script>

		<script src='js/DAT.GUI.min.js'></script>

		<script>

			if ( ! Detector.webgl ) Detector.addGetWebGLMessage();

			var container, stats;
			var camera, cameraTarget, scene, renderer;
			var projector, plane, cube;
			var mouse2D, mouse3D, ray,
			rollOveredFace, isShiftDown = false,
			theta = 45, isCtrlDown = false;

			var rollOverMesh, rollOverMaterial, voxelPosition = new THREE.Vector3(), tmpVec = new THREE.Vector3();
			var cubeGeo, cubeMaterial;
			var i, intersector;

			var gui, voxelConfig = {
				orthographicProjection: false
			};

			init();
			animate();

			function init() {

				container = document.createElement( 'div' );
				document.body.appendChild( container );

				var info = document.createElement( 'div' );
				info.style.position = 'absolute';
				info.style.top = '10px';
				info.style.width = '100%';
				info.style.textAlign = 'center';
				info.innerHTML = '<a href="http://github.com/mrdoob/three.js" target="_blank">three.js</a> - voxel painter - webgl<br><strong>click</strong>: add voxel, <strong>control + click</strong>: remove voxel, <strong>shift + click</strong>: rotate, <a href="javascript:save();return false;">save .png</a>';
				container.appendChild( info );

				scene = new THREE.Scene();

				camera = new THREE.CombinedCamera( window.innerWidth, window.innerHeight, 45, 1, 10000, -2000, 10000 );
				camera.position.y = 800;
				scene.add( camera );

				cameraTarget = new THREE.Vector3( 0, 0, 0 );


				// roll-over helpers

				rollOverGeo = new THREE.CubeGeometry( 50, 50, 50 );
				rollOverMaterial = new THREE.MeshBasicMaterial( { color: 0xff0000, opacity: 0.5, transparent: true } );
				rollOverMesh = new THREE.Mesh( rollOverGeo, rollOverMaterial );
				scene.add( rollOverMesh );

				// cubes

				cubeGeo = new THREE.CubeGeometry( 50, 50, 50 );
				cubeMaterial = new THREE.MeshLambertMaterial( { color: 0x00ff80, ambient: 0x00ff80, shading: THREE.FlatShading, map: THREE.ImageUtils.loadTexture( "textures/square-outline-textured.png" ) } );
				cubeMaterial.color.setHSV( 0.1, 0.7, 1.0 );
				cubeMaterial.ambient = cubeMaterial.color;

				// picking

				projector = new THREE.Projector();

				// grid

				plane = new THREE.Mesh( new THREE.PlaneGeometry( 1000, 1000, 20, 20 ), new THREE.MeshBasicMaterial( { color: 0x555555, wireframe: true } ) );
				plane.rotation.x = - 90 * Math.PI / 180;
				scene.add( plane );

				mouse2D = new THREE.Vector3( 0, 10000, 0.5 );

				// Lights

				var ambientLight = new THREE.AmbientLight( 0x606060 );
				scene.add( ambientLight );

				var directionalLight = new THREE.DirectionalLight( 0xffffff );
				directionalLight.position.set( 1, 0.75, 0.5 ).normalize();
				scene.add( directionalLight );

				renderer = new THREE.WebGLRenderer( { antialias: true, preserveDrawingBuffer : true } );
				renderer.setSize( window.innerWidth, window.innerHeight );

				container.appendChild( renderer.domElement );

				stats = new Stats();
				stats.domElement.style.position = 'absolute';
				stats.domElement.style.top = '0px';
				container.appendChild( stats.domElement );

				document.addEventListener( 'mousemove', onDocumentMouseMove, false );
				document.addEventListener( 'mousedown', onDocumentMouseDown, false );
				document.addEventListener( 'keydown', onDocumentKeyDown, false );
				document.addEventListener( 'keyup', onDocumentKeyUp, false );

				// add GUI
				gui = new DAT.GUI();
				gui.add(voxelConfig, 'orthographicProjection').onChange(function(){

					if ( voxelConfig.orthographicProjection ) {
						camera.toOrthographic();
						camera.position.x = 1000;
               			camera.position.y = 707.106;
                		camera.position.z = 1000;
						theta = 90;
					} else {
						camera.toPerspective();
						camera.position.y = 800;
					}

				});
				gui.close();

			}

			function getRealIntersector( intersects ) {

				for( i = 0; i < intersects.length; i++ ) {

					intersector = intersects[ i ];

					if ( intersector.object != rollOverMesh ) {

						return intersector;

					}

				}

				return null;

			}

			function setVoxelPosition( intersector ) {

				tmpVec.copy( intersector.face.normal );

				voxelPosition.add( intersector.point, intersector.object.matrixRotationWorld.multiplyVector3( tmpVec ) );

				voxelPosition.x = Math.floor( voxelPosition.x / 50 ) * 50 + 25;
				voxelPosition.y = Math.floor( voxelPosition.y / 50 ) * 50 + 25;
				voxelPosition.z = Math.floor( voxelPosition.z / 50 ) * 50 + 25;

			}

			function onDocumentMouseMove( event ) {

				event.preventDefault();

				mouse2D.x = ( event.clientX / window.innerWidth ) * 2 - 1;
				mouse2D.y = - ( event.clientY / window.innerHeight ) * 2 + 1;

			}

			function onDocumentMouseDown( event ) {

				event.preventDefault();

				var intersects = ray.intersectObjects( scene.children );

				if ( intersects.length > 0 ) {

					intersector = getRealIntersector( intersects );

					// delete cube

					if ( isCtrlDown ) {

						if ( intersector.object != plane ) {

							scene.remove( intersector.object );

						}

					// create cube

					} else {

						intersector = getRealIntersector( intersects );
						setVoxelPosition( intersector );

						var voxel = new THREE.Mesh( cubeGeo, cubeMaterial );
						voxel.position.copy( voxelPosition );
						voxel.matrixAutoUpdate = false;
						voxel.updateMatrix();
						scene.add( voxel );

					}

				}
			}

			function onDocumentKeyDown( event ) {

				switch( event.keyCode ) {

					case 16: isShiftDown = true; break;
					case 17: isCtrlDown = true; break;

				}

			}

			function onDocumentKeyUp( event ) {

				switch( event.keyCode ) {

					case 16: isShiftDown = false; break;
					case 17: isCtrlDown = false; break;

				}
			}

			function save() {

				window.open( renderer.domElement.toDataURL('image/png'), 'mywindow' );

			}

			//

			function animate() {

				requestAnimationFrame( animate );

				render();
				stats.update();

			}

			function render() {

				if ( isShiftDown ) {

					theta += mouse2D.x * 3;

				}

				ray = projector.pickingRay( mouse2D.clone(), camera );

				var intersects = ray.intersectObjects( scene.children );

				if ( intersects.length > 0 ) {

					intersector = getRealIntersector( intersects );
					if ( intersector ) {

						setVoxelPosition( intersector );
						rollOverMesh.position = voxelPosition;

					}

				}

				camera.position.x = 1400 * Math.sin( theta * Math.PI / 360 );
				camera.position.z = 1400 * Math.cos( theta * Math.PI / 360 );

				camera.lookAt( cameraTarget );

				renderer.render( scene, camera );

			}

		</script>

	</body>
</html>
